INFO: task syz-executor:1453 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:1453 tgid:1453 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:6109 [inline]
__schedule+0x16e0/0x2380 kernel/sched/core.c:7956
__schedule_loop kernel/sched/core.c:8031 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:8046
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8103
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x95d/0x1d10 kernel/locking/mutex.c:807
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1137
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock net/core/rtnetlink.c:79 [inline]
rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6684
netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2554
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6705
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x8bf/0xa70 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1895
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
__sys_sendto+0x663/0x6e0 net/socket.c:2198
__do_sys_sendto net/socket.c:2205 [inline]
__se_sys_sendto net/socket.c:2201 [inline]
__x64_sys_sendto+0xe9/0x100 net/socket.c:2201
x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f0f8bf5ac97
RSP: 002b:00007ffc6418a030 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555563d33500 RCX: 00007f0f8bf5ac97
RDX: 0000000000000028 RSI: 00007f0f8cd54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffc6418a094 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f0f8cd54670 R15: 0000000000000000
INFO: task syz-executor:1457 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:1457 tgid:1457 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6109 [inline]
__schedule+0x16e0/0x2380 kernel/sched/core.c:7956
__schedule_loop kernel/sched/core.c:8031 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:8046
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8103
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x95d/0x1d10 kernel/locking/mutex.c:807
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1137
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock net/core/rtnetlink.c:79 [inline]
rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6684
netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2554
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6705
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x8bf/0xa70 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1895
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
__sys_sendto+0x663/0x6e0 net/socket.c:2198
__do_sys_sendto net/socket.c:2205 [inline]
__se_sys_sendto net/socket.c:2201 [inline]
__x64_sys_sendto+0xe9/0x100 net/socket.c:2201
x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fbe5af5ac97
RSP: 002b:00007fff41d07e60 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00005555651d8500 RCX: 00007fbe5af5ac97
RDX: 0000000000000028 RSI: 00007fbe5bd54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff41d07ec4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fbe5bd54670 R15: 0000000000000000
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 6d6f333215c564de92c741644a4b57c848379815
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:114
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 6d6f333215c564de92c741644a4b57c848379815
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: events_long br_multicast_gc_work
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:-1 [inline]
RIP: 0010:update_stack_state+0x185/0x4d0 arch/x86/kernel/unwind_frame.c:228
Code: 48 8b 8d 68 ff ff ff e8 59 b1 f5 ff 85 c0 0f 85 2d 01 00 00 48 8b 85 50 ff ff ff 42 80 3c 38 00 74 08 4c 89 e7 e8 1b 7e 9e 00 <4c> 89 e3 4d 8b 34 24 48 8b 85 58 ff ff ff 42 80 3c 38 00 74 0c 48
RSP: 0018:ffffc90000007108 EFLAGS: 00000246
RAX: 1ffff92000000e46 RBX: ffffc90000007228 RCX: 1ffff92000000e47
RDX: 1ffff92000000e48 RSI: 1ffff92000000e46 RDI: ffffc90000007280
RBP: ffffc900000071b8 R08: ffffc900000072f0 R09: ffffc900000072e8
R10: 0000000000000015 R11: ffffffff81778d20 R12: ffffc90000007230
R13: ffffc90000007228 R14: ffffc90000097f48 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeacca5c4c CR3: 000000010cf8c000 CR4: 00000000003526b0
DR0: 0000000000000017 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
unwind_next_frame+0x39e/0x6b0 arch/x86/kernel/unwind_frame.c:315
arch_stack_walk+0x138/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:49 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:70
kasan_save_alloc_info+0x3a/0x50 mm/kasan/generic.c:565
unpoison_slab_object mm/kasan/common.c:321 [inline]
__kasan_slab_alloc+0x73/0x90 mm/kasan/common.c:347
kasan_slab_alloc include/linux/kasan.h:251 [inline]
slab_post_alloc_hook mm/slub.c:4204 [inline]
slab_alloc_node mm/slub.c:4253 [inline]
kmem_cache_alloc_noprof+0x1bf/0x410 mm/slub.c:4262
skb_clone+0x21d/0x470 net/core/skbuff.c:2084
deliver_clone net/bridge/br_forward.c:125 [inline]
br_flood+0x650/0x720 net/bridge/br_forward.c:246
br_handle_frame_finish+0x1157/0x1620 net/bridge/br_input.c:215
nf_hook_bridge_pre net/bridge/br_input.c:301 [inline]
br_handle_frame+0x5a5/0xba0 net/bridge/br_input.c:424
__netif_receive_skb_core+0xfc4/0x3a70 net/core/dev.c:5695
__netif_receive_skb_one_core net/core/dev.c:5799 [inline]
__netif_receive_skb net/core/dev.c:5914 [inline]
process_backlog+0x40b/0xaf0 net/core/dev.c:6250
__napi_poll+0xcd/0x600 net/core/dev.c:6901
napi_poll net/core/dev.c:6970 [inline]
net_rx_action+0x5dc/0xd70 net/core/dev.c:7092
handle_softirqs+0x1b0/0x5b0 kernel/softirq.c:684
__do_softirq+0xf/0x16 kernel/softirq.c:722
do_softirq+0xb8/0x110 kernel/softirq.c:566
__local_bh_enable_ip+0x74/0x80 kernel/softirq.c:493
__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
_raw_spin_unlock_bh+0x54/0x60 kernel/locking/spinlock.c:210
spin_unlock_bh include/linux/spinlock.h:397 [inline]
br_multicast_gc_work+0xfa/0x250 net/bridge/br_multicast.c:4085
process_one_work kernel/workqueue.c:3273 [inline]
process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
net_ratelimit: 84067 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:22:67:bc:38:28, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
net_ratelimit: 89942 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:22:67:bc:38:28, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)